Power shovel



June 20, 1933. H. w. KAKASKA 1, 2

POWER SHOVEL Filed March 23, 1932 3 Sheets-Sheet l u INVENTOR.

Hng W. Kakaska 'JHH6 2TB 1933.; H KAKASKA 1,914,920

POWER SHOVEL Filed March 23. 1932 I "3 Sheets-Sheet 2 INVENTOR.

Hem" 'l/[Kakaska June 20, 1933. .4, w, K KASKA 1,914,920-

POWER SHOVEL Filed March 23, 1952 3 Sheets-Sheet 3 nul v V INVENTOR. H2111" WKskaska BY a x I A TTORNE Y.

Patented drama 20, 1933 srAr-Eis 1' a OF SOUTH MILWAUKEE, W'ISCOIiTSIN, ASSIGNOR OF ONE-HALF TO FRANK HOLT, OF HILWAUKEE, WISCONSIN POWER SHOVEL Application filed March as, isaa. serial no. access. a

This invention relates to power shovels,

cranes, draglines, or similar devices, and is an improvement on my pending application Serial No. 591,330, filed February 6th, 1932.

In devices of this character, an endless propelling track for supporting the cab and the invention to provide means whereby the.

endless propelling tracks can be raisedand lowered above the turntable, whereb the base of the turntable may engage an rest upon the ground, so as to form a rigid ground-engagin structure and thereby relieve weight an strain from the tracks during the operation of the machine and to permit the swinging and convenient turning around of the machine.

@ne of the main objects of my present invention is to provide novel means for supporting the endless propelling tracks from the frameof the cab of the machine, so that the tracks and cab can be moved in parallel relation to one another, and in a straight line without any dificulty on the part of the operator and without undue strain on any part of the apparatus.

Another object of my invention is tue provision of the use of toggle devices for connecting the endless propelling tracks with the frame cab, with novel means including winding drums and pulleys tor actuating the toggle devices, whereby the toggle devices can be straightened out or'colla sed to etfectively raise or lower the propel ing tracks.

A further important obJect of my invention is the provision of novel ide means between the frame of the cab an the endless propelling tracks, so that the tracks will always he held in proper alignment during the raising and lowerin thereof.

A still further 0 ject of my invention is the provision of novel means for actuating the endless tracks, so that the drive thereof can be taken care of incident to the raising and lowering of the tracks. I

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described,

claimed and illustrated in the accompanying drawings, in which: V

Figure 1 is a fragmentary side elevation of a power shovel or other similar excavating apparatus, showing the usualendlesspropelling tracks in their lowered position in full linesand in their raised elevated position in dotted lines;

Figure 2 is a rear elevation of the power shovel, showing the tracks in their raised position, the base of the turntable resting on the ground to permit the free turning of the entire device thereon, the operating drums on one side being removed for the purpose of illustrating structural details.

Figure 3 is a fragmentary horizontal section taken substantially on the line 3-3 of Figure 1, looking in the direction of the arrows, illustrating the novel operating means for the toggle devices for bringing about the raising and lowering of the tracks;

Figure 4 is a detail section illustrating the guide means for the endless tracks incident to the raising and lowering-thereof, the section being taken substantially on the line H of Figure 2, looking in the direction of the arrows;

Referring to the drawings in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter A generally indicates a power shovel or similar excavating apparatus. The power shovel is of substantially the usual construction and embodies the cab 10 carrying the swinging boom ll-ior the shovel (not shown). lhe cab 10 is mounted for rotary movement upon a suitable turntable structure 12, which according to my invention embodies an enlarged ground-engaging base 13 and the cab with the various parts of the shovel rov back and forth over the various idler pulleys tate on the base.

In the present instance, the base 13 has been shown to be of a circular form in'plan, but it is to be understood that any desired type of base may be employed, providing the same gives an a equate supporting face for engaging the ground to support the entire machine. Mounted on opposite sides of the machine 39 are the longitudinally extending endless propellin tracks 14. Thesetracks 14 travel aroun sprocket wheels 15 rotatahly suppormd at the terminals of the track support- -1n hea 16. is ms hese beams 16 carry theusual idler wheels 1'? for engaging the runs of the endless tracks,

so as to insure the proper engagement theregf with the ground during movement at the evicer ts heretofore brought out, my invention rimarily resides in the novel means em loyed or connecting the track supporting earns 16 with the cab or body of the machine, whereby the tracks on each side of the machine can be raised or lowered as a unit in a straiht front and rear toggle devices 18 and 19 arranged on each side of the machine. Each of these toggle devices are construe ME, identically an each embody opposed toggle joints 20 and 21 arranged for movement toward and away from one another. The opposed toggle joints 20 and 21 for the sake of strength are made in pairs, as clearly shown in Figures 2 and 3 of the drawings. The lower ends of each of the pairs ofthe toggle joints 20 and 21 are pivotally connected together and to the track beams 16, as at 25, on opposite sides of the beams. The upper ends of the pairs oftoggle joints 20 and 21 are rockably mounted on a common stub shaft 23 rigidly secured to a face plate 24, bolted or otherwise con nected with the frame of the cab or the y of the machine.

lnorder to bring about the bran" 1 or collapsing of the toggle joints, so that the tracks can be raised, each of the facing pairs of toggle joints 21 of the toggle devices 18 and 19 are connected at their pivots by across shaft 22 on which is. mounted a'plurality of idler pulleys 26. A winding drum 2? is provided for each side of the cab and these winding drums have wound thereabout, the cables 28. As heretofore set forth, the toggle devices and the operating means thereior are duplicated on each side of the machine and thus the operating means for the togledevices for one side will only be descri in detail. The cable 28 is trained about one of the idler pulleys 26 carried by the to gle device li and isthen led to an idler pul ey car- As shown in Figure 3, the cable is trained till toggle devices 18 and 19 will be rought towardone another to bring about the collapsing of the toggle devices and the consequent raising of the endless repelling tracks.

in order to bring a out the straightening of the toggle devices 18 and 19 to lower the endless tracks, the outer pairs 20 of the toggle levers are connected together by cross shafts 22 and these cross shafts have mounted thereon, a plurality of idler pulleys 36. Similar idler pulleys 37 are mounted on the cross shafts 22 heretofore referred to.

Winding drums 30 and 31 are disposed below the winding drum 2? and the drum 30 has wound thereabout, a cable 32. This cable 32 is trained about the adjacent pulleys 36 and 37: carried by the cross shafts 22 and 22' of the toggle device 19 and the end of this cable is attached to a cross shaft.

A similar cable 35 is wound upon the drum 31 and extends from the drum and is wound about the pulleys 36 and,3i' carried by the cross'shafts 22 and' 22 of the toggle device 18. The end of this ca'hle is attachedto the cross shaft 22.

Obviously, when the cables 32 and 35 are wound upon their drums 30 and 31, these cables will draw the cross shafts 22 and 22' of the toggle joints 20 and 21 toward one anothtil or and thereby bring about the straightening of the toggle devices for lowering the tracks.

Connected with the winding drums '27, 30 and 31 are gear wheels 37', 38 and 39, respectively. The gear wheel 37' and the gear wheel 38 mesh with the opposite sides of a drive pinion 40, keyed or otherwise secured to the drive shaft 41. This drive shaft 41 is driven in any desired manner from the prime mover of the power shaft. The gear 39 meshes with the gear 38 and consequently the drum 31 is driven with the drum 30, but in a direction opposite thereto.

Obviously, as the cable 28 is wound upon the drum 27, the cables 32 and'35 will be paid ofi of the drums 34) and 31. Likewise, when the cables 32 and 35 are wound upon the drums 30 and 31, the cable 28 will be paid ofi from the drum 2?. To insure the proper guiding of the tracks during'their rising and lower-in movement, the sides of the cab 10 or hody o the machinecan be provided with guideways 42 for ivi guide arms 43 connec with the he '16 of the tracks.

'lih ides 42 can be provided with anti- -triction rollers 44, so as to facilitate the slid- Mi that the anti-friction rolltee ers 44 engagethe front andrear faces and side edges of the said standards.

I have provided novel means for driving the endless tracks, so as to insure the proper 5 operation thereof when the same are in their lowered driving position. This means includes forwardly extending supporting brackets 45 rigidly carried by the front pair of toggle members. The supporting arms 45 ll carry a counter shaft 46 on which is keyed sprocket wheels 47- and 48. lhe sprocket wheel 48 has trained thereabout, the drive sprocket chain 49 which leads to the drive sprocket for the endless tracks. Thesprock- 5 et chain 50 is trained over the sprocket wheel 47 and leads over a second sprocket wheel 51 keyed or otherwise secured to a drive shaft 52, which is driven from the prime mover of the power shovel in any desired way. l By this arrangement of parts, all slack in the sprocket chains 49 and 50 will be taken .care of during the raising and lowering of the endless tracks. ile l have illustrated one specific means 6 for actuating the toggles consisting of pulleys and cables, it is to be understood that other operating means for actuating the toggles can be employed. Thus, it may be desirable to operate the toggles by the use of travelling screws and feed nuts arranged at the pivot points of the toggles.

From theforegoing description, it can be seen that l have provided an exceptionally simple and novel mechanism for raising and lowering the endless propelling tracks of a power shovel, so that the base of the turntable of the machine may sit solid on the ground during the turning of the body portion of the machine.

Changes in details may be made without departing from the spirit or the scope of my invention, but what 1 claim as new is:

1. In combination with a power device of the class described including a base and a 455 cab rotatably mounted thereon, endless propellin g tracks therefor, pairs of facing toggle joints connecting the cab and track, and

' means including cables and pulleys for moving the pivot points of the to gle joints to- 551 ward and away from one anot er as and for the purpose specified.

2. ln combination with a power device or the class described including a base and a cab rotatably mounted thereon, an endless propelling track mounted on each side oi the cab and base, front and rear pairs of tog lo I joints connected to the tracks and cab, a urality of idler pulleys carried by the pivot points of the toggle joints, a plurality of W winding drums, a cable wound upon one of the drums and connecting the pulleys of the inner toggle joints of t e pairs of toggle joints together, whereby to break the toggle joints for raisin the track relative to the tilt cab and base, cales wound upon the other drum, one of the last mentioned cables being wound upon the pulleys of the toggle joints of one pair of to gle joints, and the other cable being wound upon the pulleys of the toggle joints of the other pair of toggle joints.

3. In-combin'ation with a power device of the class described including a base and a cab rotatably mounted thereon, an endless propelling track mounted on each side of the cab and base, front and rear pairs of toggle joints connected to the tracks and cab, a plurality of idler pulleys carried by the pivot points of the toggle joints, a plurality of winding drums, a cable wound upon one of the drums and connectin the pulleys of the inner toggle joints of the pairs of toggle joints together, whereby to break the toggle joints for raising the track relative to the cab and base, cables wound upon the other drum, one of the last mentioned cables being wound upon the pulleys of the toggle joints of one pair of toggle joints, and the other cable being. wound upon the ulleys of the toggle joints of the other pairpr toggle .j oints, and means for synchronpusly operating the winding drums. 1

4. In combination with a power device of the class described including a base and a cab rotatably mounted thereon, an endless propelling track therefor arranged on each side of the cab, frontand rear pairs of toggle joints connected at their ends of the cabs and tracks, a plurality of idler pulley'wheels carried by the pivdt points of the toggle joints, a winding drum, a cable wound upon the drum and trained about certain of the pulleys of the facing toggle joints of the pairs of toggle joints and secured to one of said toggle oints, a pair of winding drums having intermeshing gears, independent cables wound upon the last mentioned drums, one of said cables being wound about certain pulleys of one pair of toggle joints, and connected with one ofsaid joints, the other cable being trained about certain pulleys oi the other pair of toggle joints and anchored to one of the same a drive shaft, a gear on the drive shaft meshing with one of the gears carried by the pair of drums and a gear on the first mentioneddrum meshing with the gear on the drive shaft.

5. lln combination with a power device of the clam described including a base and a cab rotatabl moun thereon; endless propelling trac s arranged on each side of the cab, pairs of facing toggle joints connecting the cab and tracks, means for straightening and breaking the toggles, whereby to raise and lower the tracks in a vertical plane relative to the cab, pivoted guide bars connected with the pairs or toggle 'oints, and guides connected with the sides oi the cab receiving said guide bars. I 6. in combination with a power device of t.

hit h the close described including o base we cob roietafiy mounted then, an enl propelling track em'ongefi on each side of the base, means including pairs of to gle ioints for raising and lowering the tree s re ative to the cab, means for driving the tracks iiiciuding e counter shaft carrying sprockefi wheels,-o drive shofit and sprocket chain for driving one of soi gears, e. sprocket chain trainee-over the last sprocket wheel for the tracks, omi o. supporting bracket for the counter shefe oei'riefl by ihe pivot point oil one of ithe toggle joims.

In testimony me I. claim the foregoing ii have hereunto set my bond at Milwaukee, in the coiimiy of Milwaukee and owe of Wiscousin. 1

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